Wireless receiver device revocation management

Abstract

A method of carrying out wireless video communication involves at a wireless receiver (WR) device, providing a digital certificate, the digital certificate containing a High-Bandwidth Digital Copy Protection (HDCP) Key Source Vector (KSV), a device identifier for the WR device, and a digital signature cryptographically binding the identifiers; at the WR, responsive to an initiation of a wireless communication session from a wireless transmitter (WT) device, sending the digital certificate to the WT device; the WT receiving the digital certificate and having the identities in the digital certificate checked against a revocation list; and if one of the WR device's identities has been revoked, halting the wireless communication session. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

1. A method of carrying out wireless video communication, comprising:
 at a wireless receiver (WR) device:
 providing a digital certificate, the digital certificate comprising a High-Bandwidth Digital Copy Protection (HDCP) Key Source Vector (KSV), a device identifier for the WR device, a cryptographic key of the WR device, and a digital signature that cryptographically binds the HDCP KSV, the device identifier, and the cryptographic key of the WR device; 
 sending, responsive to an initiation of a wireless communication session from a wireless transmitter (WT) device, the digital certificate to the WR device, where the WT device individually checks the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature of the digital certificate against a revocation list; and 
 determining that the wireless communication session has been halted if any of the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature has been determined by the WT device to have been revoked. 
 
 
     
     
       2. The method according to  claim 1 , further comprising creating the digital signature of the digital certificate by hashing the HDCP KSV with the device identifier and the cryptographic key of the WR device. 
     
     
       3. A method of carrying out wireless video communication, comprising:
 at a wireless transmitter (WT) device:
 initiating a wireless communication session with a wireless receiver (WR) device; 
 receiving, responsive to the initiation of the wireless communication session with the WR device, a digital certificate to the WR device, where the digital certificate comprises a High-Bandwidth Digital Copy Protection (HDCP) Key Source Vector (KSV), a device identifier for the WR device, a cryptographic key of the WR device, and a digital signature that cryptographically binds the HDCP KSV, the device identifier, and the cryptographic key of the WR device; 
 individually checking the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature of the digital certificate against a revocation list; and 
 halting the wireless communication session if any of the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature has been revoked. 
 
 
     
     
       4. The method according to  claim 3 , where the digital signature of the digital certificate comprises the HDCP KSV hashed with the device identifier and the cryptographic key of the WR device. 
     
     
       5. A method of carrying out wireless video communication, comprising:
 at a wireless transmitter (WT) device:
 receiving a wireless communication of a digital certificate from a wireless receiver (WR) device, the digital certificate comprising a High-Bandwidth Digital Copy Protection (HDCP) Key Source Vector (KSV), a device identifier for the WR device, a cryptographic key of the WR device, and a digital signature; 
 checking the received digital certificate against a revocation list; and 
 halting the wireless communication session if any of the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature of the WR device's digital certificate has been revoked. 
 
 
     
     
       6. The method according to  claim 5 , where the digital signature of the digital certificate comprises the HDCP KSV hashed with the device identifier and the cryptographic key of the WR device. 
     
     
       7. A non-transitory electronic storage medium storing a digital certificate that binds a copy protection system without revocation to one with revocation to permit revocation when authenticated, the digital certificate comprising:
 a High-Bandwidth Digital Copy Protection (HDCP) Key Source Vector (KSV); 
 a device identifier for a wireless (WR) device; 
 a cryptographic key of the WR device; and 
 a digital signature that cryptographically binds the HDCP KSV, the device identifier, and the cryptographic key of the WR device; 
 where, the digital certificate can be read from the non-transitory electronic storage medium, and the HDCP KSV and the cryptographic key of the WR device are extracted from the digital certificate and sent to a host device to be verified by comparison to a revocation list to verify validity of the WR device. 
 
     
     
       8. The non-transitory electronic storage medium according to  claim 7 , where the digital signature of the digital comprises the HDCP KSV hashed with the device identifier and the cryptographic key of the WR device. 
     
     
       9. The non-transitory electronic storage medium according to  claim 7 , wherein the non-transitory electronic storage medium is situated in the wireless receiver (WR) device. 
     
     
       10. The non-transitory electronic storage medium according to  claim 7 , wherein the WR device comprises a part of a wireless speaker. 
     
     
       11. A wireless receiver (WR) device, comprising:
 a wireless receiver/transmitter device configured to receive video content and send information for verification of the WR device against a revocation list; 
 an electronic storage medium; 
 a digital certificate stored on the electronic storage medium comprising:
 a segment of code representing a High-Bandwidth Digital Copy Protection (HDCP) key source vector (KSV); 
 a device identifier for the wireless receiver device; 
 a cryptographic key of the WR device; and 
 a digital signature that cryptographically binds the KSV, the cryptographic key of the WR device, and the device identifier; and 
 
 where the WR device wirelessly sends the digital certificate via the wireless receiver/transmitter device to a host device to be verified by comparison of the HDCP KSV, the device identifier, the cryptographic key of the WR device, and the digital signature to the revocation list to verify validity of the WR device. 
 
     
     
       12. The wireless receiver device according to  claim 11 , where the wireless receiver device creates the digital signature of the digital certificate by hashing the HDCP KSV with the device identifier and the cryptographic key of the WR device. 
     
     
       13. The wireless receiver device according to  claim 11 , wherein the WR device comprises a part of a wireless repeater.